Java如何通过ssh远程连接主机并执行命令

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;
public class SshLinux {
    private static final Logger log = LoggerFactory.getLogger(SshLinux.class);
    private static String  DEFAULTCHART="UTF-8";
    /**
     * 登录主机
     * @return
     *      登录成功返回true，否则返回false
     */
    public static Connection login(String ip,
                                   String userName,
                                   String userPwd){
        boolean flg=false;
        Connection conn = null;
        try {
            conn = new Connection(ip);
            conn.connect();//连接
            flg=conn.authenticateWithPassword(userName, userPwd);//认证
            if(flg){
                log.info("=========登录成功========="+conn);
                return conn;
            }
        } catch (IOException e) {
            log.error("=========登录失败========="+e.getMessage());
            e.printStackTrace();
        }
        return conn;
    }
    /**
     * 远程执行shll脚本或者命令
     * @param cmd
     *      即将执行的命令
     * @return
     *      命令执行完后返回的结果值
     */
    public static String execute(Connection conn,String cmd){
        String result="";
        try {
            if(conn !=null){
                Session session= conn.openSession();//打开一个会话
                session.execCommand(cmd);//执行命令
                result=processStdout(session.getStdout(),DEFAULTCHART);
                //如果为得到标准输出为空，说明脚本执行出错了
                if(StringUtils.isBlank(result)){
                    log.info("得到标准输出为空,链接conn:"+conn+",执行的命令："+cmd);
                    result=processStdout(session.getStderr(),DEFAULTCHART);
                }else{
                    log.info("执行命令成功,链接conn:"+conn+",执行的命令："+cmd);
                }
                conn.close();
                session.close();
            }
        } catch (IOException e) {
            log.info("执行命令失败,链接conn:"+conn+",执行的命令："+cmd+"  "+e.getMessage());
            e.printStackTrace();
        }
        return result;
    }
    /**
     * 解析脚本执行返回的结果集
     * @param in 输入流对象
     * @param charset 编码
     * @return
     *       以纯文本的格式返回
     */
    private static String processStdout(InputStream in, String charset){
        InputStream  stdout = new StreamGobbler(in);
        StringBuffer buffer = new StringBuffer();;
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(stdout,charset));
            String line=null;
            while((line=br.readLine()) != null){
                buffer.append(line+"\n");
            }
        } catch (UnsupportedEncodingException e) {
            log.error("解析脚本出错："+e.getMessage());
            e.printStackTrace();
        } catch (IOException e) {
            log.error("解析脚本出错："+e.getMessage());
            e.printStackTrace();
        }
        return buffer.toString();
    }
}

export JAVA_HOME=/opt/module/jdk1.8.0_141' >>/etc/bashrc
echo 'export PATH=/opt/module/jdk1.8.0_141/bin:$PATH' >>/etc/bashrc
### 
source /etc/bashrc